Logic dictates that fracturing the earth in a gazillion spots would be destabilizing. On the other hand it could release tension. Also, one piece of anecdotal evidence from one location doesn’t a case make.
There are fifty years of experience with fracking in multiple locations with no negative environmental consequences. The "new idea" here is NOT "fracking", it is "horizontal drilling". "Evil fracking" is totally a fabrication of the green lefties to try to keep ANY source of fossil fuel from being developed. The majority of "anecdotal evidence" mostly comes from those same "green weenies", and it is done in opposition to fracking.